Apparatus for centrifugal casting of molten metal



Patented Sept. 10, 1940 FOB OENTBJFUGAL CASTING OF MOLTEN METAL mm muck, Tex-nits, Austria a pncauonmy 15. 1931, SerlalNo. 142,842 I mummy 20, 19:6

' 1 Claim. (01. 22-65) 5 which certain dimculties that were encountered heretofore are avoided as far as possible. The new apparatus comprises molds which are arranged downwardly inclined with respect to the vertical axis, the inclination preferably corresponding to the'direction of the resultant of the centrifugal and gravitational forces acting upon the metal which is being cast, and room being left for the air contained inthe molds to escape unhindered. Thereby, as an object of the invention, the substantial advantage is attained that impurities (for example, particles of slag) collect at the inner end of the mold, for example at the head of the casting or at a runner which is to be knocked off, and the casting is practically free of impurities and also of pores, blisters and pipes, otherwise due to entrapped air or gases.

It is a further object of the invention'to cause the metal in the apparatus to run downward from a higher level into the communicating outer and lower ends of the molds and to enter and fill each of said molds by rising therein in a direction opposite to the action of centrifugal force. Hereby a more even filling'of the molds and also a quieter pouring of the metal are obtained besides further advantages explained below.

The improved apparatus according to the invention is chiefly characterized by a plurality of molds arranged radially around and downwardly inclined relative to a vertical axis and means for feeding molten metal to the molds. The latter means comprise a central pouringhead, a circumferential channel arranged outside the molds and a plurality of ducts being downwardly inclined with respect to said axis and separated from the molds. The ducts lead radially to said circumferential channel, which is in open connection with the outer ends of each of the molds and thus allows the molten metal to run simultaneously into all of the molds. Any conventional means are provided for revolving the pouring head, ducts, circumferential channel andmolds around said vertical axis.

It is furthermore advisable to arrange special openings for the escape of air and gases from said molds laterally and at a higher level than the said entering openings of the molds which may overwise be closed at their inner endsince hereby runners or dead heads to be discarded will be kept, as small as possible and may be re-' moved with a minimum of trouble and work.

In a further preferred .embodiment of my apparatus the transverse section of said ducts and circumferential channel is such that the castings produced therein are utilizable as semi-manufactures. 5

In Figs. 1 to. 3 there are illustrated by way of example some forms of apparatus in accordance with the invention.

In Figs. 1 and 2 an apparatus is illustrated in section along the line AB and in plan view respectively. Fig. 3 shows certain details of the mold illustrated in Figs. 1 and 2, in partial vertical cross-section.

The molten metal is fed to the molds 24 by means of a central pouring head 2. The molds 24 16 are divided along their longitudinal axes, for the purpose of rapid emptying, and are shown in Fig.

2 as being uncovered or opened. The communicating system preferably comprises ducts 23, separated from the molds and leading down- 20 wardly from the central pouring head 2 into an annular, i. e. circumferential duct which connects the molds at their lower open ends and from which ducts 25 lead into the molds. The

molds are preferably open at both ends, but can be closed at their ends 2'l which are directed toward the rotational axis if it is somehow assured, for example by means of lateral or upside openings 5, as shown in Fig. 3; that the air contained in the ducts and molds can escape unhindered when the metal is poured. The'openings.5 at the molds 24, which are divided horizontally along their longitudinal axes for the purpose of rapid emptying, ofiertwo advantages. these openings, as soon as the moulds are filled, and this is a signal to stop the pouring of the' metal. Further, owing to the fact that the impurities collect at that end of the moulds, the

impure metal will escape by the openings 5 and 40 form smallrunners which can easily be removed. The central pouring head 2 and the moulds are arranged on the base members 8' and 8" which carry them, so that they can be removed individually, but could be placed upon and removed from the driving element jointly with the base members. It is thus possible easily and quickly to place on the driving element another base member with empty moulds and a central pouring head and the process can, in some cases be continued by repeated use of the same moulds and the same central pouring head with one and the same charge. In order to avoid, upon removal of the moulds, that the whole relatively heavy base member system must be'removed, this may The molten metal can escape through 35 be carried out in two parts comprising, for example, as shown by Fig. 1, the lighter upper part 8 upon which the moulds and the central pouring head are arranged, and the lower part I",

upon which the upper part 8' is placed. The drive of the base member about the vertical axis may be effected by a motor driven shaft, for example, as illustrated in Fig. 1,- through a spur gear II, arranged on the underpart-of the base member system 8', 8" and with which a pinion ll mounted on a horizontal driving shaft l2 meshes, or by a roller system, friction system, etc. The relatively large rotating parts are firmly borne in that the base member is supported, for example by its rim ll, on a number of rollers l8 arranged. for example, on a base plate I 5.. Above the centrifugal casting device, there is to be superposed the main ladle (not shown), or an auxiliary ladle as described in my copending application of even date, forming a division of the present application Serial Number 142,842. The ducts 23 and II can and preferably have such a cross-section, that the castings produce within can be used al semi-manufactures and do not form waste;

What I claim is:

An apparatus for centrifugal casting of molten metal, comprising a plurality of molds arranged radially around a vertical axis and the outer ends of which are downwardly inclined.

ends of all molds allowing molten metal when fed into said pouring head and the apparatus is rotated to simultaneously run through said ducts and channel into all molds, and means for revolving the said pouring head, ducts, circum- 20 ferential channel and molds simultaneously around said vertical axis.

, JULIUS HAUCK. 

